4) Lacks a lot of customizability - mac really sucks in this, Actually I have been a linux user for a long time now and I like to customize a lot of things, mac doesn't even supports the basic ones. eg: Its not possible to change the behavior of closing the laptop lid on mac without having to install a app like InsomniaX etc.

Yes. Actually I download lot of things and I have to keep my lid open where as in Windows I could just keep PC running even when lid is closed.

And I'd like to add some Pro's too:-

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1) The keyboard layout is awesome, The keys are properly spaced and Its less probable to make a typo on mac compared to a normal keyboard.

Yes but then Windows Keyboard is lot different and so you are bound to make mistakes to start with but yes I agree that keys are just awesome.

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2) Fast booting as well as fast shutdown speed, The best I have seen so far on any OS, Maybe Ubuntu is a little bit faster but mac outruns windows by a hefty margin.

Will slow down like Windows. My 6 months old MAC now takes more time to boot than before.